<template>
  <div id="root">
    <div class="todo-container">
      <div class="todo-wrap">
        <MyHeader :receive="receive" @addTodo="addTodo" />
        <MyList :todos="todos" />
        <MyFooter :todos="todos" />
		<Test />
		<Test2 />
		<Test3 />
      </div>
    </div>
  </div>
</template>

<script>
import pubsub from 'pubsub-js'
import MyHeader from './components/MyHeader.vue'
import MyList from './components/MyList.vue'
import MyFooter from './components/MyFooter.vue'
import Test from './components/Test.vue'
import Test2 from './components/Test2.vue'
import Test3 from './components/Test3.vue'

export default {
  name: 'App',
  components: {
    MyHeader,MyList,MyFooter,Test,Test2,Test3
  },
  data(){
		return {
			todos:JSON.parse(localStorage.getItem('todos')) || []
		}
	},
	methods:{
		// 添加一个todo
		addTodo(todoObj){
			this.todos.unshift(todoObj);
		},
		receive(x){
			console.log('我是App组件,我收到了数据:',x);
		},
		// 勾选or取消勾选一个todo
		checkTodo(id) {
			this.todos.forEach((todo) => {
				if(todo.id == id) todo.done =!todo.done
			})
		},
		updateTodo(id,val) {
			this.todos.forEach((todo) => {
				if(todo.id == id) todo.title =val
			})
		},
		// 删除一个todo
		deleteTodo(_,id){
			this.todos = this.todos.filter((todo) => {
				return todo.id !== id;
			})
		},
		checkAllTodos(done) {
			this.todos.forEach((todo) => {
				todo.done = done;
			});
		},
		//清除所有已经完成的todo
		clearAllTodo(){
			this.todos = this.todos.filter((todo) => {
				return !todo.done
			});
		}
	},
	watch:{
		todos: {
			deep:true,
			handler(value){
				localStorage.setItem('todos',JSON.stringify(value))
			}
		}
	},
	mounted() {
		// 在全局事件总线上面注册事件
		this.$bus.$on('checkTodo',this.checkTodo)
		this.$bus.$on('updateTodo',this.updateTodo)
		//this.$bus.$on('deleteTodo',this.deleteTodo)
		this.pubId = pubsub.subscribe('deleteTodo',this.deleteTodo)
		this.$bus.$on('clearAllTodo',this.clearAllTodo)
		this.$bus.$on('checkAllTodos',this.checkAllTodos)
	},
	beforeDestroy() {
		// 销毁前将全局事件总线上注册的事件销毁
		this.$bus.$off('checkTodo')
		this.$bus.$off('updateTodo')
		//this.$bus.$off('deleteTodo')
		pubsub.unsubscribe(this.pubId)
		this.$bus.$off('clearAllTodo')
		this.$bus.$off('checkAllTodos')
	}
}
</script>

<style>
	body {
	  background: #fff;
	}

	.btn {
	  display: inline-block;
	  padding: 4px 12px;
	  margin-bottom: 0;
	  font-size: 14px;
	  line-height: 20px;
	  text-align: center;
	  vertical-align: middle;
	  cursor: pointer;
	  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
	  border-radius: 4px;
	}

	.btn-danger {
	  color: #fff;
	  background-color: #da4f49;
	  border: 1px solid #bd362f;
	}

	.btn-danger:hover {
	  color: #fff;
	  background-color: #bd362f;
	}
	.btn-edit {
		color: #fff;
		background-color: skyblue;
		border: 1px solid skyblue;
		margin-right: 5px;
	}

	.btn:focus {
	  outline: none;
	}

	.todo-container {
	  width: 600px;
	  margin: 0 auto;
	}
	.todo-container .todo-wrap {
	  padding: 10px;
	  border: 1px solid #ddd;
	  border-radius: 5px;
	}
</style>
